Recomended

Sn0wbreeze 2.0 was released just some time back by iH8Sn0w. As you might already know, Sn0wbreeze is like PwnageTool for Mac, using which you can cook your own custom firmwares of iOS 4.1 on Windows without having to upgrade your baseband. This would ensure you can unlock your iPhone using ultraSn0w later on the older baseband.

Sn0wbreeze 2.0 supports following devices:

iPod touch 1G (Must be jailbroken on any firmware version)

iPod touch 2G (Non-MC Model, must be jailbroken on any firmware, if not, then use iREB from here)

iPod touch 2G (MC Model, must be on iOS 3.1.2. Does not need to be jailbroken on 3.1.2)

Step 5: Sn0wbreeze will now ask you to browse for your .ipsw file. Select the correct iOS 4.1 firmware .ipsw file by clicking the “Browse” button. Sn0wbreeze will verify the selected file

Step 6: Now if you are on iPhone 3GS (New Bootrom) or iPod touch 3G, make sure you hit “General”-> and check “Use iBooty Method (3.1.2 Installation Required!). Also check “Activate The iPhone” if you are on unofficial carrier and want Sn0wbreeze to hacktivate your phone.

Step 7: Now simply select “Build IPSW”. Sn0wbreeze will now create the custom .ipsw file for your iPhone which will be jailbroken.

Step 8: Now you will have to restore your iPhone to this custom firmware 4.1 that you just cooked using Sn0wbreeze for your iPhone. Click on your phone from the sidebar in iTunes and then press and hold left “Shift” button on the keyboard and then click on “Restore” (Not “Update” or “Check for Update”) button in the iTunes and then release the “Shift” button.

This will make iTunes prompt you to select the location for your custom firmware 4.1. Select that custom .ipsw file and click on “Open”.

Step 9: Wait for iTunes to complete the restore. Your iPhone screen at this point will be showing a progress bar indicating installation progress. After the installation is done, iPhone will restart automatically and you should now have a fully jailbroken iPhone running on iOS 4.1.

Unlock iOS 4.1 (old baseband)

Once you are done with the jailbreak, you can follow our step by step guide posted here to unlock your iPhone on iOS 4.x, on older baseband using Ultrasn0w.

Once you are done with the unlocking and jailbreak process. You can now restore everything you had backed up with iTunes at the start.

Disclaimer: The above guide is for information and education purposes only. Proceed at your own risk

Raju is the founder-editor of Technology Personalized. A proud geek and an Internet freak, who is also a social networking enthusiast. You can follow him on Facebook and on Twitter. Mail Raju PP. Follow rajupp